问题
填空题
省略乘号时,a×b=______,y×y=______,(a+b)×(7+8)=______.
答案
a×b=ab;
y×y=y2;
(a+b)×(7+8)=(a+b)×15=15(a+b).
故答案为:ab,y2,15(a+b).
省略乘号时,a×b=______,y×y=______,(a+b)×(7+8)=______.
a×b=ab;
y×y=y2;
(a+b)×(7+8)=(a+b)×15=15(a+b).
故答案为:ab,y2,15(a+b).